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Finding the Third Proportional to 339 and 663.56

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Solution

The third proportional to 339 and 663.56 is: 1,298.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    339 : 663.56 = 663.56 : x
  2. Step 2: Convert to fraction form
    339/663.56 = 663.56/x
  3. Step 3: Cross multiply
    339x = 663.56 × 663.56
  4. Step 4: Simplify right side
    339x = 440,315.19
  5. Step 5: Solve for x
    x = 440,315.19/339
  6. Step 6: Final answer
    x = 1,298.86

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Why These Related Problems?

These problems maintain the same ratio (1.96) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.